Revise for accuracy.

Based on ddev#4426 (comment).

docs/content/users/providers/platform.md

@@ -44,7 +44,7 @@ web_environment:
 
 ### Designating a Primary Database
 
-If you have more than one database on your Platform.sh project, you must choose and designate the one you’d like to use as DDEV’s primary `'db'`. Every database will be pulled with the integration, but you’ll need to specify which one DDEV loads into its default `'db'` database. Each non-primary database will be imported using the same name as its remote.
+All databases for your Platform.sh project will be pulled locally, with each name matching its remote. When you have more than one, you can optionally tell DDEV which to use as the primary and load into the default `'db'` database.
 
 You can do this by setting `PLATFORM_PRIMARY_RELATIONSHIP`: